You see a lot of photos in magazines of well-funded, well-equipped SWAT teams like the FBI Hostage Rescue Team fast roping out of helicopters onto the roofs of their objectives. I know that many agencies don't have these kinds of resources but, if you do, train to use them.
Law enforcement is behind the curve in adopting helicopters and employing them in less conventional operations. While some departments do maintain choppers and pilots, few, if any, have ever prepared fast rope teams to be inserted from them, or even an "air assault" landing and insertion capability for their SWAT teams along the lines of that used by the Air Cavalry.
Yes, I know helicopters are dangerous, have an unappealing crash rate, and training in such techniques as rappelling or deploying from them is certain to result in many injuries and not a few deaths. But we are far beyond the point where America can afford to continue making every decision for her survival constrained by a naïve social expectation that nothing bad ever happens to anyone and undertaking anything risky is negligent.
According to some of the Russians, this type of assault would not have worked at Beslan. They feel fast rope teams are "too fancy" and take a lot of training. Commanders repeated concerns that helicopters can be easily shot out of the sky with a single RPG, and that they must be used with a combination of other things and never alone. They feel that at Beslan, after the explosions, the arrival of choppers with deployable soldiers would have been even less effective.
I disagree. Helicopters-though expensive-are a tool that can and should be employed if possible. If in the midst of a battle to rescue hostages, it is determined the helicopters are not beneficial, they do not have to be used for the assault.